#include <iostream>
using namespace std;
/*
Declarăm și citim datele de intrare(“n” și vectorul).
Declarăm două variabile cu rol de contor(“positiveNumbers” si “negativeNumbers”) 
pe care le initializam cu valoarea zero.
Parcurgem vectorul si contorizam numerele pozitive in “positiveNumbers”,
cat si numerele negative in “negativeNumbers”.
Daca “pozitiveNumbers” este egal cu “negativeNumbers”:
In caz afirmativ afisam mesajul “Da”, altfel, afisam mesajul “Nu”.
*/
 
int main() {
	int n;
	cin >> n;
	int countNo = 0;
	for (int i = 1; i <= n; ++i) {
		int currentNo;
		cin >> currentNo;
		if (currentNo > 0) {
			++countNo;
		} else if (currentNo < 0) {
			--countNo;
		}
	}
	if (countNo == 0) {
		cout << "Da";
	} else {
		cout << "Nu";
	}
	return 0;
}

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CgoKCjgKMCAwIDAgMCAwIDAgMSAtMQomcmFycjsgRGEKCg==

8
0 0 0 0 0 0 1 -1
→ Da